A passage from Carl Sagan's book written 25 years ago
(media.kotakuinaction2.win)
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What you're missing in all of this is each of those variations would take more iterations to reach a 50% probability of arising by pure chance than the total number of generations.
"Oh, just stack up a billion billion-to-one-odds mutations" is not a rational explanation when there have only been a million generations.
"Thing with longer beak can reach things it likes to eat better than thing with shorter beak, even if it is just 0.01mm longer each generation" is hardly "billion-to-one odds mutation".
That's like saying "tall people tend to have tall kids, and dwarfs tend to have dwarf kids? Billion-to-one odds! Billions-to-one! Tiny asian parents have seven foot tall black kids all the time, the odds of a tiny asian parent having tiny asian kids is zero! ZERO!". Longer-beaked birds tend to have longer-beaked chicks.